GWT: 0.6.1, verify xml syntax conformity before using users and profiles configuration and messages parameter files
The portal configuration and parameter files are encoded in XML, and manually edited by the portal admin.
It is easy to write bad XML manually, so it is easy to break configuration files and something easy to break the portal launch.
Solution
Verify XML syntax conformity before users and profiles configuration and messages parameter files.
(from redmine: issue id 2515, created on 2019/03/13 by Serge Heiden)